Something like ~40% of US individual taxpayers only need to file a form 1040 [1] for their federal tax return.
Another large group will need that plus a small number of other forms, most of which will be easy to fill. For example if they are getting a tax credit to help with health insurance costs there is form for that. That one's easy to fill out because you will be mailed a report that contains the information needed for the form. The report is in a standard format, and the instructions will be of the form copy line X form the report to line Y of the form.
If your income is just salary plus some investment income from investments like mutual funds you don't have enough deductions to be worth itemizing [2], it generally is pretty straightforward.
[2] In the US you have a choice between "itemizing" your deductions, which means you have to list all of them, or taking the "standard" deduction, which is around $15k for a single person and around $30k for a married couple. Around 90% of people take the standard deduction.
Another large group will need that plus a small number of other forms, most of which will be easy to fill. For example if they are getting a tax credit to help with health insurance costs there is form for that. That one's easy to fill out because you will be mailed a report that contains the information needed for the form. The report is in a standard format, and the instructions will be of the form copy line X form the report to line Y of the form.
If your income is just salary plus some investment income from investments like mutual funds you don't have enough deductions to be worth itemizing [2], it generally is pretty straightforward.
[1] https://www.irs.gov/pub/irs-pdf/f1040.pdf
[2] In the US you have a choice between "itemizing" your deductions, which means you have to list all of them, or taking the "standard" deduction, which is around $15k for a single person and around $30k for a married couple. Around 90% of people take the standard deduction.